{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:47:57.715409", "data_source": "ERA5", "website": "http://wexa.jamstec.go.jp", "Author": "Patrick Martineau"}, "event_id": {"name": "Event ID", "description": "A unique identifier based on: beginning_date, end_date, longitude, and latitude", "value": "2011-Jul-26_to_2011-Aug-01_231.5_54.5"}, "event_label": {"name": "Event label", "description": "Integer-valued grid identifier that uniquely labels each detected extreme event in space and time, consistent with the corresponding labels stored in the NetCDF dataset.", "value": 2011070001412}, "status": {"name": "Status", "description": "An ongoing event denotes an event that lasts up to the latest data available. These events are subject to change as newer data is added.", "value": false}, "start_date": {"name": "Start date", "description": "First date on which grid points are under the influence of an event", "value": "July 26 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 01 2011"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "figures_available": {"name": "Figures available", "description": "True if figures were pre-generated for this event", "value": true}, "detection_var": {"name": "Detection variable", "description": "Variable used for the detection scheme", "value": "t2m"}, "event_type": {"name": "Event type", "description": "Type of the event detected", "value": "Cold spell"}, "area": {"name": "Area", "description": "The area (in square meters) encompassing all grid points under the influence of an event during its lifetime.", "value": 83985.28340896202}, "countries_affected": {"name": "Countries affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the countries affected by an event during its lifetime.", "value": ["Canada", "United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North America"]}, "oceans_affected": {"name": "Ocean basins affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the ocean basins affected by an event during its lifetime.", "value": ["The Coastal Waters of Southeast Alaska and British Columbia"]}, "center_lat": {"name": "Center latitude", "description": "Latitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 54.5}, "center_lon": {"name": "Center longitude", "description": "Longitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 231.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "231.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 226.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 232.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 53.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 57.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-07-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.65, 56.75], [-133.75, 57.0], [-133.53, 57.53], [-133.0, 57.75], [-132.75, 57.65], [-132.5, 57.75], [-132.25, 57.65], [-132.0, 57.75], [-131.47, 57.53], [-131.32, 57.18], [-131.25, 57.15], [-131.0, 57.25], [-130.47, 57.03], [-130.32, 56.68], [-129.97, 56.53], [-129.82, 56.18], [-129.75, 56.15], [-129.5, 56.25], [-128.97, 56.03], [-128.75, 55.5], [-128.97, 54.97], [-129.32, 54.82], [-129.47, 54.47], [-130.0, 54.25], [-130.25, 54.35], [-130.5, 54.25], [-131.03, 54.47], [-131.18, 54.82], [-131.53, 54.97], [-131.68, 55.32], [-131.75, 55.35], [-132.0, 55.25], [-132.5, 55.46], [-133.0, 55.25], [-133.53, 55.47], [-133.75, 56.0], [-133.65, 56.25], [-133.75, 56.5], [-133.65, 56.75]]]]}, "2011-07-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.65, 56.75], [-133.75, 57.0], [-133.53, 57.53], [-133.0, 57.75], [-132.75, 57.65], [-132.5, 57.75], [-132.25, 57.65], [-132.0, 57.75], [-131.47, 57.53], [-131.32, 57.18], [-131.25, 57.15], [-131.0, 57.25], [-130.47, 57.03], [-130.32, 56.68], [-130.25, 56.65], [-130.18, 56.68], [-130.03, 57.03], [-129.5, 57.25], [-129.25, 57.15], [-129.0, 57.25], [-128.75, 57.15], [-128.5, 57.25], [-127.97, 57.03], [-127.82, 56.68], [-127.47, 56.53], [-127.32, 56.18], [-126.97, 56.03], [-126.75, 55.5], [-126.97, 54.97], [-127.37, 54.8], [-127.25, 54.5], [-127.47, 53.97], [-127.82, 53.82], [-127.97, 53.47], [-128.5, 53.25], [-129.03, 53.47], [-129.25, 54.0], [-129.15, 54.25], [-129.18, 54.32], [-129.5, 54.46], [-130.0, 54.25], [-130.25, 54.35], [-130.5, 54.25], [-131.03, 54.47], [-131.18, 54.82], [-131.53, 54.97], [-131.68, 55.32], [-131.75, 55.35], [-132.0, 55.25], [-132.5, 55.46], [-133.0, 55.25], [-133.53, 55.47], [-133.75, 56.0], [-133.65, 56.25], [-133.75, 56.5], [-133.65, 56.75]]]]}, "2011-07-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.65, 56.75], [-133.75, 57.0], [-133.53, 57.53], [-133.0, 57.75], [-132.75, 57.65], [-132.5, 57.75], [-132.25, 57.65], [-132.0, 57.75], [-131.47, 57.53], [-131.32, 57.18], [-131.25, 57.15], [-131.0, 57.25], [-130.47, 57.03], [-130.32, 56.68], [-130.25, 56.65], [-130.18, 56.68], [-130.03, 57.03], [-129.5, 57.25], [-129.25, 57.15], [-129.0, 57.25], [-128.75, 57.15], [-128.5, 57.25], [-127.97, 57.03], [-127.82, 56.68], [-127.47, 56.53], [-127.32, 56.18], [-126.97, 56.03], [-126.75, 55.5], [-126.97, 54.97], [-127.32, 54.82], [-127.35, 54.75], [-127.25, 54.5], [-127.47, 53.97], [-127.82, 53.82], [-127.97, 53.47], [-128.5, 53.25], [-128.75, 53.35], [-129.0, 53.25], [-129.53, 53.47], [-129.75, 54.0], [-129.65, 54.25], [-129.7, 54.38], [-129.82, 54.32], [-129.97, 53.97], [-130.5, 53.75], [-131.03, 53.97], [-131.18, 54.32], [-131.25, 54.35], [-131.5, 54.25], [-131.75, 54.35], [-132.0, 54.25], [-132.25, 54.35], [-132.5, 54.25], [-133.03, 54.47], [-133.25, 55.0], [-133.12, 55.3], [-133.53, 55.47], [-133.75, 56.0], [-133.65, 56.25], [-133.75, 56.5], [-133.65, 56.75]]]]}, "2011-07-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.03, 54.47], [-133.25, 55.0], [-133.03, 55.53], [-132.5, 55.75], [-132.25, 55.65], [-132.18, 55.68], [-132.15, 55.75], [-132.18, 55.82], [-132.53, 55.97], [-132.75, 56.5], [-132.53, 57.03], [-132.0, 57.25], [-131.75, 57.15], [-131.5, 57.25], [-130.97, 57.03], [-130.82, 56.68], [-130.75, 56.65], [-130.5, 56.75], [-130.25, 56.65], [-130.18, 56.68], [-130.03, 57.03], [-129.5, 57.25], [-129.25, 57.15], [-129.0, 57.25], [-128.75, 57.15], [-128.5, 57.25], [-127.97, 57.03], [-127.82, 56.68], [-127.47, 56.53], [-127.32, 56.18], [-126.97, 56.03], [-126.75, 55.5], [-126.97, 54.97], [-127.32, 54.82], [-127.35, 54.75], [-127.25, 54.5], [-127.35, 54.25], [-127.25, 54.0], [-127.47, 53.47], [-128.0, 53.25], [-128.25, 53.35], [-128.5, 53.25], [-128.75, 53.35], [-129.0, 53.25], [-129.25, 53.35], [-129.5, 53.25], [-130.03, 53.47], [-130.2, 53.88], [-130.5, 53.75], [-131.03, 53.97], [-131.18, 54.32], [-131.25, 54.35], [-131.5, 54.25], [-131.75, 54.35], [-132.0, 54.25], [-132.25, 54.35], [-132.5, 54.25], [-133.03, 54.47]]]]}, "2011-07-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.03, 54.47], [-133.25, 55.0], [-133.03, 55.53], [-132.5, 55.75], [-132.25, 55.65], [-132.18, 55.68], [-132.15, 55.75], [-132.18, 55.82], [-132.53, 55.97], [-132.75, 56.5], [-132.53, 57.03], [-132.0, 57.25], [-131.75, 57.15], [-131.5, 57.25], [-130.97, 57.03], [-130.82, 56.68], [-130.75, 56.65], [-130.5, 56.75], [-130.25, 56.65], [-130.18, 56.68], [-130.03, 57.03], [-129.5, 57.25], [-129.25, 57.15], [-129.0, 57.25], [-128.47, 57.03], [-128.25, 56.5], [-128.35, 56.25], [-128.32, 56.18], [-128.25, 56.15], [-128.0, 56.25], [-127.47, 56.03], [-127.25, 55.5], [-127.35, 55.25], [-127.25, 55.0], [-127.35, 54.75], [-127.25, 54.5], [-127.35, 54.25], [-127.25, 54.0], [-127.47, 53.47], [-128.0, 53.25], [-128.25, 53.35], [-128.5, 53.25], [-128.75, 53.35], [-129.0, 53.25], [-129.25, 53.35], [-129.5, 53.25], [-130.03, 53.47], [-130.2, 53.88], [-130.5, 53.75], [-131.03, 53.97], [-131.18, 54.32], [-131.25, 54.35], [-131.5, 54.25], [-131.75, 54.35], [-132.0, 54.25], [-132.25, 54.35], [-132.5, 54.25], [-133.03, 54.47]]]]}, "2011-07-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.03, 54.47], [-133.25, 55.0], [-133.03, 55.53], [-132.5, 55.75], [-132.0, 55.54], [-131.5, 55.75], [-131.25, 55.65], [-131.0, 55.75], [-130.7, 55.63], [-130.53, 56.03], [-130.0, 56.25], [-129.75, 56.15], [-129.68, 56.18], [-129.53, 56.53], [-129.0, 56.75], [-128.47, 56.53], [-128.32, 56.18], [-128.25, 56.15], [-128.0, 56.25], [-127.47, 56.03], [-127.25, 55.5], [-127.35, 55.25], [-127.25, 55.0], [-127.35, 54.75], [-127.25, 54.5], [-127.35, 54.25], [-127.25, 54.0], [-127.47, 53.47], [-128.0, 53.25], [-128.25, 53.35], [-128.5, 53.25], [-128.75, 53.35], [-129.0, 53.25], [-129.25, 53.35], [-129.5, 53.25], [-130.03, 53.47], [-130.2, 53.88], [-130.5, 53.75], [-131.03, 53.97], [-131.18, 54.32], [-131.25, 54.35], [-131.5, 54.25], [-132.0, 54.46], [-132.5, 54.25], [-133.03, 54.47]]]]}, "2011-08-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-129.25, 54.5], [-129.03, 55.03], [-128.5, 55.25], [-128.25, 55.15], [-128.0, 55.25], [-127.47, 55.03], [-127.25, 54.5], [-127.47, 53.97], [-128.0, 53.75], [-128.25, 53.85], [-128.5, 53.75], [-129.03, 53.97], [-129.25, 54.5]]], [[[-132.25, 55.0], [-132.03, 55.53], [-131.5, 55.75], [-131.25, 55.65], [-131.0, 55.75], [-130.47, 55.53], [-130.32, 55.18], [-129.97, 55.03], [-129.75, 54.5], [-129.97, 53.97], [-130.5, 53.75], [-131.03, 53.97], [-131.18, 54.32], [-131.25, 54.35], [-131.5, 54.25], [-132.03, 54.47], [-132.25, 55.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.87773300223671}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.279460144685641}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [9.750763097973561, 9.270977382443277, 9.580228991954584, 9.485293663747143, 9.527494283575777, 9.352632269581704, 10.965660950929987]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [6.549808285006691, 5.852076359324997, 6.3323905240827685, 7.06790349853793, 6.907589318608132, 6.64092266458465, 7.838110613493484]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.8807698129115566, -3.3669222246941914, -3.1984164122247267, -3.301699197528511, -3.332163349927694, -3.6781170538911643, -2.583967790033296]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.5111919891946854, -4.107758479235031, -4.380561696006168, -4.317248130292342, -4.258249233514107, -4.87773300223671, -3.865667212239032]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3012284113197259, -1.2913449708766191, -1.2431805536261022, -1.1656531804334491, -1.1912788713899412, -1.258264719332846, -1.2048830751157085]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5042621094565316, -1.6974316908232192, -1.475686835804174, -1.3637660797957434, -1.5831327946372244, -1.411199089701722, -1.335399576381082]}}